Having completed the first Release Candidate (RC) of Service Pack 1 for Windows Vista, Microsoft has now released RC1 of Service Pack 3 for Windows XP. Microsoft generally uses the term Release Candidate (RC) for full-featured trial versions which only need to be tested for flaws.

The combined package is about 340MBytes in size and can currently only be downloaded from Microsoft's connect website by registered beta testers. It updates all the 32-Bit versions of XP from Home to Professional. Apart from the English language version there is also a German and a Japanese version. In addition, the website offers a script which adds a string to the Registry and allows any version of XP to receive the respective RC1 update suitable for this XP via Windows Update (download size for XP Professional: about 91 MBytes). However, an initial trial installation this way proved unsuccessful.

As usual, SP3 will contain all the patches and updates released earlier, including those which were part of previous versions. According to Microsoft there is a total of more than 1000. In addition, it provides several add-ons which have been available separately, for example Background Intelligent Transfer Service (Bits) 2.5, Windows Installer 3.1, Management-Console (MMC) 3.0 and Core XML Services 6.0. New features include the integration of Network Access Protection (NAP), a feature which is already familiar from Vista and in a Server 2008 environment, for example, only allows access to the local network if the respective PC is running Windows at the current patch level.

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